I’ve been spending most of yesterday turning my predetermined parameters for a calendar from two years back into actual calendar sheets showing moon phases, solstices, equinoxes, and potential eclipses. Turns out there’s actually three leap years for every 16 year cycle in which there are only 23 months instead of 24.
Since the moon is considerably larger in the sky than the sun, I decided that eclipses might not actually happen only on the 16th of a month, but ooccasionally also on a 15th or 1st. And there is a possibility that you get two eclipses two days in a row.
With all these things taken into consideration, the results look like this.
There are of course 16 of these. I plan on making these always available for players, though I don’t expect them to ever look on them. But they should. There could be rather important information on it. Eclipses are no time to be wandering around in the forest or be out on sea, and things might also get a bit more dicy on the equinoxes.
While I put together these charts, I noticed that there are 12 special days every cycle on which celestial events overlapp. There are the four days when the solstices and equinoxes fall on a full moon, and four days on which eclipses might happen during regular equinoxes. Two days on which the solstices fall on a New Moon, and finally there are the two days on which an eclipse might happen on a new moon equinox. Those are really bad days. Somehow every ancient legend of heroes dying and cities being destroyed seems to date it to one of these days. Crazy shit will be going down on these days, no matter where the party will happen to be then.
As I said, this really isn’t something that any GM needs. But when you do have it, I think it might actually be quite fun.